A person wants to know if the proportion of the people in Dubai who commutes to work by public transportation is on the rise. What size sample should be obtained if the person wants an estimate within 2 percentage points of the true proportion with 90% confidence if a. the person uses the 2010 estimate 10.7% obtained from a previous survey, b. the person does not use any prior estimate

Q: Julia wants to determine a 99 percent confidence interval for the true proportion of times she rolls…

A: We have given that  Margin of error =E = 0.05 Sample proportion p^=x/n = 1/6 = 0.167 99% confidence…

Q: A study found that 73% of elementary students buy lunch at school at least once a month. How large a…

A: Given,sample proportion(p^)=0.73margin of error(E)=0.03α=1-0.95=0.05α2=0.025Z0.025=1.96       (from…

Q: You are running a political campaign and wish to estimate, with 95% confidence, the proportion of…

A: Formula for the sample size needed to estimate a population proportion is

Q: A nutritionist wants to estimate the difference between the percentage of men and women who have…

A: a. Computing the sample size: The confidence level is 90%. Therefore, α = 0.1,α/2=0.05 and 1-( α/2)…

Q: . What size sample should be obtained if she wishes the estimate to be within 0.04 with 90​%…

A: here given, p = 0.32 MOE  = 0.04 Z-score for 90% confidence level = 1.645 (  use Excel command…

Q: A researcher wants to estimate, at 92% confidence level, the prportion of covid-19 symptomatic…

A: Solution: From the given information, confidence level is 0.92 and E=0.03.

Q: A 99% confidence interval (with n = 1, 018) estimates the actual mean amount of data usage a month…

A: It is given that, the 99% confidence interval is (5.701, 6.599).

Q: An internet service provider wishes to estimate, to within one percentage error, the current…

A: Given,margin of error(E)=0.01sample…

Q: A polling agency wants to determine the percentage of voters in favor of extending tax cuts. They…

A:

Q: A researcher wishes to estimate, with 93% confidence, the percentage of people who own a home…

A:

Q: Suppose 1,620 of 2,000 registered voters sampled said they planned to vote for the Republican…

A:

Q: According to a survey conducted by Pew Research Center in June 2009, 44% of people aged 18 to 29…

A:

Q: A Plitical pollster wants to know what proportion of voters think james burger should go away and…

A:

Q: A vet wants to determine the proportion of household pets that have pet insurance. What size sample…

A: Given that  Margin of error=E=0.06 ,  90% confidence

Q: t was believed that 25% of the students have internet connection at home. How large a sample is…

A:

Q: A television sports commentator wants to estimate the proportion of citizens who​ "follow…

A: Solution: From the given information, confidence level is 0.96, p=0.54 and E=0.02.

Q: A television sports commentator wants to estimate the proportion of citizens who​ "follow…

A: compute sample size ( n ) = n=(Z/E)^2*p*(1-p)

Q: A 99% confidence interval (with n = 1, 018) estimates the actual mean amount of internet usage a…

A:

Q: elevision sports commentator wants to estimate the proportion of Americans who follow professional…

A:

Q: A school administrator wishes to conduct a poll to estimate the percentage of full time college…

A:

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A: Given Information: Confidence level = 90% = 0.90 Margin of Error E=5%=0.05 Sample proportion of…

Q: You have been hired by a consortium of local car dealers to conduct a survey about the purchases of…

A: Given: Confidence level = 95% Margin of error = 0.03 Formula Used: n = ZαMargin of error2 p(1-p)

Q: A tv sports commenter wants to estimat th proportion of citizens who "follow professional football."…

A:

Q: Suppose we have the results of a Gallup survey (simple random sampling) which asks participants for…

A:

Q: A researcher wishes to estimate the proportion of adults who have high speed internet access. What…

A:

Q: A pollster wishes to estimate, with 99% confidence, the proportion of people who approve of how…

A: From the provided information, Confidence level = 99% Margin of error = 0.03

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A: To estimate the male proportion P1 = 0.223 and female proportion P2 = 0.198 Margin of Error E = 0.02…

Q: A researcher wished to estimate the proportion of households that have broadband internet access.…

A: Given in 2009 proportion of households having broadband internet access  =0.635Confidence interval =…

Q: etermine what percent of pre-kindergarten children ages 3 to 5 whose mother had a bachelor's degree…

A: When we don't have any prior information about the population proportion, we generally take it as…

Q: A pollster wishes to estimate, with 95% confidence, the proportion of people who believe that recent…

A: a) Assume p-hat as 0.5, since no preliminary estimate is available.

Q: A public opinion pollster wants to estimate the percentage of voters who favor an upcoming proposal.…

A:

Q: A pollster wishes to estimate, with 90% confidence, the proportion of people who approve of how…

A:

Q: An HR administrator wishes to know the proportion of employees that are currently using a very…

A: It is given that margin of error (E) is 0.14 and the confidence level is 0.80.

Q: A Gallup survey based on telephone and face-to-face interviews with 4,220 adults in China, aged 15…

A: Solution :  Given :               n = 4220   confidence level = 95% Margin of error(d) = 2.2% and…

Q: The Labor Bureau wants to estimate, at a 90% confidence level, the proportion of all households that…

A: Computing the sample size: The confidence level is 90%. Therefore, α = 0.10 and α/2=0.05. The margin…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Here, there is no information about the population parameter. Hence, use the conservative estimate…

Q: A transportation planner wishes to estimate the proportion of commuters who drive to work within…

A: There is no specific information about the value of p. Hence, we can consider p as 0.5. A…

Q: .For a test market, find the sample size needed to estimate the true proportion of consumers…

A: Obtain the sample size of a no preliminary estimate for p. The formula of sample size is, Use EXCEL…

Q: t is believed that 12% of Americans use a traditional antenna to watch network television.  How…

A: There are 12% of Americans who use a traditional antenna to watch network television i.e. p=0.12.…

Q: A transportation planner wishes to estimate the proportion of commuters who drive to work within…

A: The provided information are: Margin of error (E) = 0.05 Confidence level = 90%

Q: A pollster wishes to estimate, with 90% confidence, the proportion of people who believe the United…

A: (1)   Obtain the minimum sample size with the no previous estimate.   The minimum sample size is…

Q: A television sports commentator wants to estimate the proportion of citizens who follow professional…

A: Given that Critical value: Using the z-table, the critical value at 96% confidence level is

Q: 46. A quality-conscious disk manufacturer wishes to know the fraction of disks his company makes…

A: Given, Total discs n = 1067 No of non defective = 993 No of defective = 1067 - 993 = 74

Q: Suppose we estimated that 68 percent of Santa Fe students believe that black coffee is disgusting.…

A:

Q: A school administrator wishes to conduct a poll to estimate the percentage of full-time college…

A: The formula for the sample size is as follows: Here, zα/2 is the critical value at 94% confidence…

Q: If a manufacturer conducted a survey among randomly selected target market households and wanted to…

A: Given that, If the prior estimate is unknown, assume that the sample proportion is, Critical…

Q: At a certain college, it is estimated that fewer than 25% of the students have cars on campus. Does…

A: Given that,  H0: p= 0.25  H1: p=! 0.25 Sample size is n= 90 And x= 28 Proportion, P= x/n  = 28/90…

Q: An economist wants to know if the proportion of the children in the United States that speak a…

A: It is given that sample proportion p-hat is 0.22 and the margin of error is 0.02.

Q: For a test market, find the sample size needed to estimate the true proportion of consumers…

A:

Q: The Department of Health and Human Services has been asked to estimate the proportion of "latch-key"…

A: